because 'I'm younger and healthier I have all the time in the world to have a career when the kids are older'
But this is the best time build up your career, when you have the most time available in your future to reap the rewards! If you're younger than him, then presumably he had this early period of his life free of family restrictions - which is why he now has the career options he does. Why shouldn't you get the same?
The next argument is of course that he earns more. Well that's never going to change if you don't get the chance to work your way up, is it?
. (the chance he already had before DC, remember?) It's only going to become more of a difference unless you are able to work and progress in your career
A good call centre job can often have great opportunities to progress into other areas of the business, since you learn so much about how the business works. But you do need to prove yourself as capable and committed - and you need him to do at least his fair 50% share of the household and child care for you to have the capacity to do that.
Caitlin Moran writes in her book that " there is no such thing as 'male pride' about work and income. It's not produced by some gland in their balls, which you don't have. Instead, 'male pride' is this: fear about being poor and unvalued. A fear of having no money or power. A fear of becoming unemployable. And as soon as you call it that, you realise, quite obviously, that duh - women have that too. "
And the reason that people mention how vulnerable you are not being married, is that if you split up you have no claim on any of the money he has built up from earning over the years: none of the equity in the house, no spousal maintenance for having given up your career, no access to his pension if he dies before you.
Him saying that his part of the bargain is doing the difficult job which pays lots of money, and yours is to do the unpaid (but hard) work of family and home, is him making sure that he is never poor and powerless. You, in the other hand risk having no money and savings of your own, and no power either in or out of the relationship.
That's why it's so critical for you to keep your job and build up your own career. If he doesn't support you in that, then he's keeping all the good stuff for himself. He's taking the benefit of his work (career progression which offers good future earnings, savings and equity) all for himself, and he's taking a full half of the benefit of your work (nice home, happy well-brought-up children) for himself too. Does that seem remotely fair to you?